Dynamo-electric machine



' April 23 {1927.

IF. KESSELRING DYNAMO ELECTRIC MACHINE Filed April 14. 1926 2 Sheets-Sheet 1 April 26,1927.

F. KESSELRING DYNAMO ELECTRIC MACHINE Filed April 14. 1926 2 Sheets-Sh eet 2 Patented Apr. 26,- 1927.

FRITZ KESSELRING, OF FURTH, GERMANY.

PATENT OFFICE.

DYNAMO-ELECTRIC MACHINE.

Application filed April 14, 1926, Serial No. 102,089, and in Germany April 18, 1825.

The present invention relates to a new and improved dynamo electric machine for motor vehicle suitable for supplying continuous current for lighting lamps and also 6 high voltage current for igniting the explosive charge in an internal combustion on ine.

oreparticularly the invention relates to dynamo electric machines of the class described in which the active magnetic field is cpmposed of a magnetic flux ap roximately independent of the number 0 revolutions of the armature and of a magnetic flux proportional to the said revolutions of the armature.

The main object of the present invention is to provide an improved and more efficient dynamo electric machine of the above type and I attain this and other objects,

more particularly set forth in the annexed specification, by the following means:

1. The armature generating the ignition current and the armature generating the lighting current are side by side co-axially arran ed and supported by but two bearings.

2. e armature generating the ignition current is excited not by a permanent magnet but by at least one electro-magnet of the machine generating the current for 39 lighting.

3. The make-and break device in the primary circuit of the armature generating 1%I1lti0l1 current rotates at a lower speed t an the armature itself.

4. The conductor for the ignition current passes through an axial bore of the flange of the armature.

5.The conductor for rent of the armature generating the ignition current passes through an axial bore of the outer flange ofthe ignition armature over a collector-ring to a battery of accumulators.

6. At least one pole of the machine generating the lighting current is provided with an iron projection carrying a winding for an automatic switch or a governor and which acts moreover as a magnetic shunt to the pole of the mag the primary curnet.

To enable the invention to be fully understoodI will describe it by reference to the accompanying drawings, in which- Fig. 1 shows in a diagrammatical manner a dynamo electric machine for generating current for, lighting having six poles of which four have a constant excitation while two poles have variable excitation.

Fig. 2 illustrates in a diagrammatical manner a dynamo electric machine generating current for ignition and for lighting adapted to be used in explosion motors having but one cylinder. The dynamo for generating the lighting current has two poles and the control is effected by a third brush.

Figs..3 to 7 show the preferred construction of a machine according to the invention the machine having six poles as shown in Fig. 1.

Fig. 3 is a sectiontaken on line G. J. K. of Fig. 4,

Fig. 4 is a cross section on line AB of Fig. 3, I

Fig. 5 is a side elevation, a cover of the interruption-device being removed,

Fig. 6 is a section on line OD of Fig. 3 an Fig. 7 is a section on line EF of Fig. 3.

The dynamo electric machine shown is provided with means to supply ignition current for but one sparking plug of an 30 explosion motor. The dynamo electric machine may be adapted for motors with two or more cylinders and for such purposes a high voltage distributing switch of well known construction is to be used.

As shown in Fig. 1' the six magnet poles (shown without the outer casing) are provided with windings arranged in two exciting circuits. The windings 3 of four constant poles are supplied with approx imately constant current collected by the brushes 5, 6 on the collectors 8. The variable poles 2 are provided with a winding 9 through which a current passes which varies as the number of revolutions of the armature. This current is, taken-ofi' b the brush 5 and by an auxiliary brush arranged between the main brushes 5 and 6. The dynamo electric machine supplies current to a battery of accumulators 10. One of the constant poles 1 is provided with a prolongation 11 on which the coil 12 of an automatic switch is arranged. The automatic switch 13 comprises two contacting members 14 and 15. The device works as follows:

If the poles are excited a part of the magnetic flux passes through the projection 11, the armature 13 is attracted and the contacting members 14, 15 are brought in contact with each other. Current flows through coil 12 to the battery of accumulators. The pole 12 retains the armature as long as the voltage generated by the armature is in excess of the voltage of the battery.

Fig. 2 shows the wiring and connections of the complete dynamo electric machine, the part thereof generating the lighting current is a two-pole machine with a control by means of a third brush. It however should be noted that it is preferable to magnetize the armature for generating ignition current as well as the automatic switch and the governor by the constant poles.

The armature 16 by means of which currunning in axial direction. In the said bore sleeves 43, 44, 45, of insulating materialare arranged through which passes the conductor 22 carrying high tension-current to'brush 46 and over metal-disc 23 to the conductor 47 leading to the sparking plug. Another conductor passing through the same sleeves 43, 44,45 connects the low pressure winding 21 with collector 25, the current flowing over brush 26 and conductor 48 to the make and break device 27 and to a terminal 49. 50 denotes a blade spring, holding a protective cover in its position. The contact lever 41 is arranged within a casing 52 rotatably mounted in the face plate 33 and which is provided with an arm 53. By turning the rent for lighting is generated is provided easing 52 the ignition may be timed at will.

with a flange 17 carrying the armature 19 for generating ignition current. The armature 19 has a face plate with sleeve 20 by which the armatures are journalled in the bearings. The armature 19 comprises a low pressure winding 21 and a high pressure winding 22. From the said winding 22 a conductor passes through the sleeve 20 to a well insulated metallic disc 23 and to the sparking plug 24 or to a high tension distributor if such is necessary. The winding 21 is connected to a collector 25 from which current is taken by a brush 26 the current flowing to the make and break device 27 and from there either over switch 28 to the battery 10 or direct to the earth. 29 denotes a condenser. The make and break device 27 runs at alower speed than the two armatures. The armature shaft may be driven by any convenient means.

The construction shown has the advantage that the machine is comparatively very short and that it may be produced at low cost, moreover, it produces by starting and during the run of the explosion motor very powerful sparks.

The machine'shown in Figs. 3 to 7 comprises a six pole lighting dynamo with the wiring as shown in Fig. 1. Within a casing 30 four constant poles 1 and two variable poles 2 are arranged with the exciting windings 3 and 9. The face plate 31 is provided with an opening through which the pole prolongation 11 projects. In the plate 31 ball bearings 32 are arranged on which the armature shaft 42 runs. On the opposite side of casing. 30 a face plate 33 with ball bearing 34 is arranged by which the armature shaft is journalled. The plate 33 moreover carries two ball bearings 35, 36 in which the shaft 37 of the make and break device runs. Shaft 37 is driven by the armature shaft flange 20 by means of a worm 38 and worm wheel 39. To shaft 37 a cam 40 is rigidly fixed which actuates the make and break contact lever 41. Flange 17 is made in one with the armature shaft 42 of the dynamo 16; flange 20 is provided with a bore I wish it clearly understood that I do not confine my invention to the particular construction of the details and their arrangement as shown and described as various changes may be made without departing from the spirit of the invention.

What I wish to secure by U. S. Letters Patent is 1. A dynamo electric machine comprising in combination electro-magnets to produce magnetic fields, an armature shaft journalled by but two bearings, two armatures co-axially arranged side by side, on sald shaft, one adapted to generate current for lighting and the other adapted to generate current for ignition, at least one pole of said electromagnets of the light-dynamo having a prolongation adapted to magnetize the ignition armature.

2. A dynamo electric machine comprising in combination electro-magnets to produce magnetic fields, an armature shaft journalled by but two bearings, two armatures coaxially arranged side by side on said shaft, one adapted to generate current for ignition. at least one pole of said electromagnets of the light-dynamo having a prolongation adapted to magnetize the ignition-armature, a make and break device rotating at a lower speed than the ignition armature.

3. A dynamo electric machine comprising in combination electro-magnets to produce magnetic fields, an armature shaft journalled by but two bearings, two armatures coaxially arranged side by side, on said shaft, one adapted to generate current for lighting and the other adapted to generate current for ignition, at least one pole of said electromagnets of the light-dynamo having a prolongation adapted to magnetize the ignition armature, a make and break device rotating at a lower speed than the ignition armature, an axial bore in the flange of the ignition armature conducting means passing through said bore to the sparking plug.

4. A dynamo electric machine comprising in combination electro-magnets to produce magnetic fields, an armature shaft journalled by but two bearings, two armatures coaxially arranged side by side, on said shaft, one adapted to generate current for lighting and the other adapted to generate current for ignition, at least one pole of said electromagnets of the light-dynamo having a relongation adapted to magnetize the ignitionarmature, a make and break device rotating at a lower speed than the ignition armature, an axial bore in the flange of the ignition armature conducting means passing through said bore to the sparking plug, the primary current of the ignition armature being connected over a collector to a'battery of accumulators.

5. A dynamo electric machine comprising in combination electro-magnets to produce magnetic fields, an armature shaft journalled by but two bearings, two armatures co-axial- 1y arranged side by side, on said shaft, one adapted to generate current for lighting and the other adapted to generate current. for ignition, at least one pole of said electromagnets of the light-dynamo having a .prolongation protruding on the side of the collector adapted to receive a winding, to form a magnetic shunt, and to actuate an automatic switch or governor.

In witness whereof I aflix my signature.

FRITZ KESSELRING. 

